* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f5f5f5;
}



.header {
    width: 1200px;
    height: 80px;
    margin: 0 auto;
    position: relative;
}

.header a.header-logo {
    display: block;
    width: 195px;
    height: 41px;
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    font-size: 0;
    background-image: url(../images/logo.png);
    background-repeat: no-repeat;
    background-size: 100%;
    text-align: center;
    line-height: 41px;
}

.header .header-nav {
    position: absolute;
    top: 50%;
    left: 300px;
    transform: translateY(-50%);
    width: 260px;
    height: 35px;
    line-height: 35px;
}

.header .header-nav ul {
    list-style: none;
    display: flex;
}

.header .header-nav ul li {
    margin-right: 40px;
}

.header .header-nav ul li:hover {
    border-bottom: 1px solid #00a4ff;
}

.header .header-nav ul li a {
    text-decoration: none;
    color: #000;
}


.header .header-search {
    position: absolute;
    top: 50%;
    right: 118px;
    transform: translateY(-50%);
    margin-right: 20px;
}

.header .header-search input {
    width: 412px;
    height: 40px;
    border-radius: 40px;
    padding-left: 15px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.pos-r {
    position: relative;
}

.header .header-search button {
    width: 16px;
    height: 16px;
    background-image: url(../images/search.png);
    background-repeat: no-repeat;
    background-size: 100%;
    position: absolute;
    top: 50%;
    right: 10px;
    transform: translateY(-50%);
    border: none;
}

.header .header-user {
    position: absolute;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
}

.header-user img,
span {
    display: block;
}

.header-user img {
    margin-right: 8px;
}

section {
    width: 100%;
    height: 420px;
    background-color: #0092CB;

}

section .sec-list {
    width: 191px;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #005576;
}

.sec-list ul {
    width: 100%;
    height: 100%;
}

.section {
    width: 1200px;
    height: 100%;
    margin: 0 auto;
    position: relative;
    background-image: url(../uploads/banner.png);
    background-repeat: no-repeat;
}

.section .sec-list {
    width: 191px;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #005576;
}

.sec-list ul {
    width: 100%;
    height: 100%;
    list-style: none;
}

.sec-list ul li {
    width: 100%;
    height: 46px;
    line-height: 46px;
    position: relative;

}

.sec-list ul li::after {
    content: "";
    display: block;
    width: 10px;
    height: 10px;
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    background-image: url(../images/right.png);
    background-repeat: no-repeat;
    background-size: 100%;
}

.sec-list ul li a:hover {
    color: #00a4ff;
}

.sec-list ul li:hover::after {
    background-image: url(../images/right-hover.png);
}

.sec-list ul li a {
    text-decoration: none;
    color: #fff;
    margin-left: 20px;
}

.myCourse {
    width: 218px;
    height: 305px;
    position: absolute;
    top: 60px;
    right: 0;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.myCourse h2 {
    font-weight: normal;
    color: #fff;
    display: block;
    width: 75px;
    height: 48px;
    font-size: 15px;
    text-align: center;
    line-height: 48px;
}

.myCourse .course-list {
    width: 218px;
    height: 257px;
    border-radius: 10px;
    background-color: #fff;
    padding: 14px;
}

.course-list .list {
    width: 190px;
    height: 183px;

}

.list .list-item {
    width: 100%;
    height: 53px;
    line-height: 53px;
    border-bottom: 1px solid #ccc;
    margin-bottom: 9px;

}

.list-item h5 {
    font-size: 14px;
    font-weight: normal;
    height: 20px;
    line-height: 20px;
}

.list-item p {
    font-size: 12px;
    height: 17px;
    display: flex;
    line-height: 17px;
    margin-top: 9px;

}

.list-item p>span {
    height: 100%;
}

.myCourse .course-list input {
    width: 100%;
    height: 32px;
    border-radius: 32px;
    background-color: #00A4FF;
    border: none;
    color: #fff;
    margin-top: 9px;
}

.nav {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    height: 60px;
    line-height: 60px;
    justify-content: space-between;
    padding: 0 20px;
    position: relative;
    background-color: #fff;
}

.nav .rec h2,
.interest h2 {
    font-weight: normal;
    font-size: 18px;
    color: #00a4ff;
}

.nav .nav-list {
    width: 911px;
    position: absolute;
    top: 50%;
    left: 112px;
    transform: translate(0, -50%);
}

.nav .nav-list ul {
    list-style: none;
    display: flex;
    justify-content: flex-start;
    align-items: center;

}

.nav .nav-list ul li {

    padding: 0 10px;
    border-right: 1px solid #ccc;
    height: 25px;
    line-height: 25px;
    padding: 0 25px;
}

.nav .nav-list ul li:last-child {
    border-right: none;
}


.nav .nav-list ul li a {
    text-decoration: none;
    color: #000;
}

/* 内容部分 */
.main {
    width: 1200px;
    margin: 0 auto;
}

.main .main-rec {
    width: 100%;
    height: 601px;
    margin-top: 30px;
}

.main-rec .main-rec-header {
    width: 100%;
    height: 40px;
    position: relative;
}

.main-rec .main-rec-header h2 {
    font-size: 21px;
    position: absolute;
    top: 0;
    left: 0;
    font-weight: normal;
}

.main-rec .main-rec-header span {
    position: absolute;
    top: 0;
    right: 0;
    color: #ccc;
    margin-right: 20px;
}

.main-rec .main-rec-header span::after {
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    position: absolute;
    top: 50%;
    right: -20px;
    border-top: 1px solid #ccc;
    border-right: 1px solid #ccc;
    transform: translateY(-50%) rotate(45deg);
}

.main-rec-content {
    display: flex;
    flex-wrap: wrap;
    flex: 5;
    justify-content: space-between;

}

.main-rec-content .main-rec-item {
    width: 228px;
    height: 271px;
    margin-bottom: 20px;
    background-color: #fff;
}

.main-rec-item p {
    font-size: 14px;
    margin-left: 20px;
    padding: 20px 0;
}

.main-rec-item p:nth-child(2) {
    height: 37px;
}

.main-rec-item p:last-child {
    display: flex;
    color: #ccc;
}

.main-rec-item p:last-child span {
    margin-right: 8px;
    color: #F97822;
}

.main-web,
.main-python {
    width: 1200px;
    height: 431px;
    margin-bottom: 20px;
}

.main-web .main-web-header,
.main-python .main-python-header {
    width: 100%;
    height: 45px;
    position: relative;
}

.main-web .main-web-header h2,
.main-python .main-python-header h2 {
    font-size: 21px;
    font-weight: normal;
    position: absolute;
    top: 0;
    left: 0;
}

.main-web .main-web-header span,
.main-python .main-python-header span {
    position: absolute;
    top: 0;
    right: 0;
    color: #ccc;
    margin-right: 20px;
}

.main-web .main-web-header span::after,
.main-python .main-python-header span::after {
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    position: absolute;
    top: 50%;
    right: -20px;
    border-top: 1px solid #ccc;
    border-right: 1px solid #ccc;
    transform: translateY(-50%) rotate(45deg);
}

.main-web-header ul,
.main-python-header ul {
    list-style: none;
    display: flex;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    justify-content: space-around;
    width: 308px;
}

.main-web-header ul li a,
.main-python-header ul li a {
    text-decoration: none;
    color: #333333;
}

.main-web-header ul li a:hover,
.main-web-header ul li a.active,
.main-python-header ul li a:hover,
.main-python-header ul li a.active {
    color: #00a4ff;
}

.main-web-content,
.main-python-content {
    width: 100%;
    height: 386px;
    position: relative;
}

.main-web-content .web-content-left,
.main-python-content .python-content-left {
    width: 228px;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    margin-right: 15px;
}

.web-content-right,
.python-content-right {
    width: 957px;
    height: 100%;
    position: absolute;
    top: 0;
    right: 0;

}

.web-right-top,
.python-right-top {
    margin-bottom: 15px;
}

.web-right-bottom,
.python-right-bottom {
    display: flex;
    justify-content: space-between;
}

.web-right-bottom .web-right-bottom-item,
.python-right-bottom .python-right-bottom-item {
    width: 228px;
    height: 271px;
    background-color: #fff;
}

.web-right-bottom-item p,
.python-right-bottom-item p {
    margin-left: 20px;
    font-size: 14px;
}

.web-right-bottom-item p:nth-child(2),
.python-right-bottom-item p:nth-child(2) {
    margin-top: 20px;
    height: 37px;
}

.web-right-bottom-item p:last-child,
.python-right-bottom-item p:last-child {
    display: flex;
    color: #ccc;
    padding-top: 16px;
}

.web-right-bottom-item p:last-child span,
.python-right-bottom-item p:last-child span {
    margin-right: 8px;
    color: #F97822;
}

/* ai区域 */
.main-ai,
.mian-java {
    width: 1200px;
    height: 316px;
    margin-bottom: 15px;
}

.main-ai .main-ai-header,
.main-java .main-java-header {
    width: 100%;
    height: 45px;
    position: relative;
}

.main-ai .main-ai-header h2,
.main-java .main-java-header h2 {

    font-size: 21px;
    font-weight: normal;
    position: absolute;
    top: 0;
    left: 0;

}

.main-ai .main-ai-header span,
.main-java .main-java-header span {
    position: absolute;
    top: 0;
    right: 0;
    color: #ccc;
    margin-right: 20px;
}

.main-ai .main-ai-header span::after,
.main-java .main-java-header span::after {
    content: '';
    display: block;
    width: 10px;
    height: 10px;
    position: absolute;
    top: 50%;
    right: -20px;
    border-top: 1px solid #ccc;
    border-right: 1px solid #ccc;
    transform: translateY(-50%) rotate(45deg);
}

.main-ai-header ul,
.main-java-header ul {
    list-style: none;
    display: flex;
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    justify-content: space-around;
    width: 308px;
}

.main-ai-header ul li a,
.main-java-header ul li a {
    text-decoration: none;
    color: #333333;
}

.main-ai-header ul li a:hover,
.main-ai-header ul li a.active,
.main-java-header ul li a:hover,
.main-java-header ul li a.active {
    color: #00a4ff;
}

.main-ai-content,
.main-java-content {
    display: flex;
    justify-content: space-between;

}

.main-ai-content .main-ai-content-item,
.main-java-content .main-java-content-item {
    width: 228px;
    height: 271px;
    background-color: #fff;
}

.main-ai-content-item p,
.main-java-content-item p {
    margin-left: 20px;
    font-size: 14px;
    padding: 20px 0;
}

.main-ai-content-item p:nth-child(2),
.main-java-content-item p:nth-child(2) {

    height: 37px;
}

.main-ai-content-item p:last-child,
.main-java-content-item p:last-child {
    display: flex;
    color: #ccc;
    padding-top: 16px;
}

.main-ai-content-item p:last-child span,
.main-java-content-item p:last-child span {
    margin-right: 8px;
}

.main-ai-content-item p:last-child span,
.main-java-content-item p:last-child span {
    margin-right: 8px;
    color: #F97822;
}

footer {
    width: 100%;
    background-color: #fff;
    height: 273px;
    margin-top: 20px;
}

.footer {
    width: 1200px;
    margin: 0 auto;
    position: relative;
    height: 100%;
}

.footer-left {
    width: 432px;
    height: 148px;
    position: absolute;
    top: 60px;
    left: 0;
}

.footer-left a {
    display: block;
    width: 195px;
    height: 41px;
    text-decoration: none;
    font-size: 0;
    background: url(../images/logo.png) no-repeat;
    background-position: 0 0;
    margin-bottom: 24px;
}

.footer-left p {
    font-size: 12px;
    font-weight: normal;
}

.footer-left button {
    width: 120px;
    height: 36px;
    border: 1px solid #5CC4FF;
    background-color: #fff;
    margin-top: 14px;
}


.footer-right {
    width: 516px;
    height: 151px;
    position: absolute;
    top: 60px;
    right: 0;
}

.footer-right {
    width: 516px;
    height: 151px;
    display: flex;
    justify-content: space-between;
}

.footer-right dl dt {
    margin-bottom: 12px;
}

.footer-right dd {
    color: #666666;
    font-size: 14px;
}